[time-nuts] newbie question Thunderbolt supply
EWKehren at aol.com
EWKehren at aol.com
Mon Aug 27 14:44:13 UTC 2012
There are components and traces.
Bert
In a message dated 8/27/2012 10:10:45 A.M. Eastern Daylight Time,
jsternmd at att.net writes:
Are these thermal pads temp conductive or insulative? If you want heat
dissipation why not use the readily available thermal grease used for
semiconductor mounting? Cheap and not really messy if applied correctly
jerry
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of EWKehren at aol.com
Sent: Monday, August 27, 2012 9:38 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] newbie question Thunderbolt supply
Thank you. Will look for it here under thermal pad.
Bert
In a message dated 8/27/2012 8:08:30 A.M. Eastern Daylight Time,
azelio.boriani at screen.it writes:
Here in Europe Farnell has the 3M thermal pad in sheets (105x150mm)...
On Mon, Aug 27, 2012 at 12:48 PM, ew <ewkehren at aol.com> wrote:
>
> Chris
> Starting with 3.4 W used by the Tbolt my battery version burns 4.4 W.
> Using a switcher do generate 7 V 4.8 W and running the 7805 directly
> from 14.5 V 6.2.W. I use like you an IC temp sensor, two stage op amp
> driving a fan holding the backplate temp constant and total power
> goes up to 7.6 W since the oven has to work harder. T bolt, switchers
> and all regulators are on the other side of the 3/32" Alu plate. The
> AC switcher
is
> not included in the power numbers. but is also on the plate. Plate is
held
> at 40 C.
> I am looking for a way to more closely couple the Tbolt circuit board
> to the back plate and am looking for the material switchers use
> between semiconductor and cooling plate Any one know where I can buy
> it in sheet form?
> Bert Kehren
>
>
>
>
> -----Original Message-----
> From: Chris Albertson <albertson.chris at gmail.com>
> To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> Sent: Sun, Aug 26, 2012 12:31 pm
> Subject: Re: [time-nuts] newbie question Thunderbolt supply
>
>
> On Sun, Aug 26, 2012 at 3:46 AM, <EWKehren at aol.com> wrote:
> > Having played with several solutions I found the best is a 12 V 1 A
> switcher with the output voltage increased to 15 V, check the
> capacitors and if necessary replace with 25 V. I laid out a PC
> board that has a TC7662A inverter followed by a 79L12. Also on the
> board is a 7812 followed by
a
> 7805.
> Putting them in series gives me good thermal distribution. ....
>
> ne of the advantages of generating waste heat like that is that you
> can ut the heat to good use. I build a temperature controlled fan.
> It is ery simple a temperature sensor IC connects to an opamp that
> drives a ower transistor that drives a 12V fan.
> As for the power supply. I used a filter that does not drop any
> volts
and
> can't see any RF on the DC using my old 365 Tek scope or by using a
more
> ensitive RF power meter.
>
> hris Albertson
> edondo Beach, California
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